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Coconut
06-09-2010, 06:58 AM
Hi, I have an application written in 1.x days. The performance has been acceptable for its purpose until lately we are getting complains from users about it being slower with newer hardware supporting 3.x and up. I believe it is the lighting that is causing the slowdown. Anyone has similar experience and idea how to address it?

Thanks in advance,

Coconut

peterfilm
06-09-2010, 10:05 AM
which cards? (manufacturer, I mean)
we're actually getting much better ffp performance than custom shaders on modern nvidia quadro's.

Coconut
06-09-2010, 10:23 AM
On both NVIDIA and ATI.

mhagain
06-09-2010, 10:33 AM
It's possible that fixed function lighting may not be optimally implemented in newer hardware. I know for a fact that it's the case for fog (which may be software emulated in SM3 or above hardware) so it's reasonable to suppose that as other fixed functionality gets further deprecated, the implementation may suffer.